Interior air filter

I have a 1994 Caprice....does anyone know if it has an air filter (HEPA) in the cab? I have a manual that references it, but never covers it.

I don't believe that year had cabin filters. From what I've read in the past they started using them in domestic models in 1994 but were limited at that time to certain Ford and Mercury models. If it does have one it is more than likely located in your glove box behind an access panel.